Installation And Assembly; Ground Conditions; Excavation - Garantia Cristall Notice D'installation Et D'entretien


Tanks

Compacted substructure

Terrain

Embedding
Smooth sand max. grain size 8/16
according to DIN 4226-1

Telescopic access man hole
component

Covering layer

Concrete layer for surfaces used
by passenger cars
6.1

Ground conditions

Before the installation the following points must be clarified:

The construction specific compatibility of the ground according to DIN 18196

Maximum occurring ground water levels in relation to the drainage factors of the terrain.

Occurring load types e.g. types of traffic
To ascertain the physical properties of the terrain, a ground survey report should be requested from the
local planning department.
6.2

Excavation

So that sufficient working room is available, the surface area of the excavation should exceed the tank
dimensions on all sides by approximately 500 mm, the distance from solid building constructions must be
a minimum of 1200 mm.
The excavation slope is according to DIN 4124. The ground for setting down must be level and smooth
and must provide a sufficient load bearing capacity.
The depth of the excavation must be measured so that the maximum allowable earth covering (1000 mm
from the top surface of the tank) above the tank is not exceeded. For an all year round utilisation of the
system it is necessary that the tank and the water supply pipes and equipment are installed in a frost free
environment. The depth for a frost free installation is generally around 800 mm, precise data for this
should be requested from the appropriate administrative authority.
As an under surface for setting down, a layer of smooth sand with a grain size of 8/16 ac-cording to
DIN 4226-1 and a depth of from 150 to 200 mm should be used.
6.2.1 Ground water and cohesive (impermeable) soil
For groundwater only appearing occasionally and
impermeable soils such as clay, it is necessary to
provide a sufficient run off (drainage) for the
ground or seepage water so that the tanks are
never deeper in the ground water than 500 mm.
In certain cases the drainage pipe may lead into a
300 mm diameter vertical pipe with a submersible
pump installed so that excess water will be
automatically pumped away. This pump system
must be inspected at regular intervals.
If it is expected that the tanks may be immersed deeper, then it is especially important to install a
sufficient drainage.
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6.

Installation and assembly

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